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United States Patent
1,326,955
Issue Date:
January 6, 1920
Current U.S. Class:
369/30.01
; 369/69; 84/1; 84/4; 984/357
Current International Class:
G10D 13/00 (20060101); G10H 3/00 (20060101); G10H 3/03 (20060101); G10D 13/08 (20060101)
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